Gengou Lib vs JHP byNSDev
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Gengou Lib
Quickly convert between Japanese era names and Christian era years. Features include era and year searching, period and era pickers, and the ability to display the current year in either system. Texts can be shown in Japanese or English.
- Era and year search
- Period picker
- Era picker
- Christian era year picker
- Japanese era year picker
- Show this year button
- Multi-language text display
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"Gengou Lib." is a quick reference of the Japanese era system. This application has functions as below. - Era and Year Search - Period picker - Era picker - Christian era year picker - Japanese era year picker - Show this year button - Texts can be shown in Japanese or English independently of the default language setting. - Application badge can show this year number in the Japanese era or the Christian era. The Japanese era system identifies a year by the combination of the era name (Gengou or Nengou) and the year number within the era. For example, A.D. 2001 is Heisei 13. Please note that two Gengou schemes were used in Parallel from 1331 to 1392 during Nanboku-chō period. This application would be very useful if you are working with the governments, municipal offices and/or certain companies in Japan.
JHP byNSDev
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Software that displays the population of the municipality of Japan (man, woman), the number of households. Currently it is data from 1995 onwards, but we will add it sequentially. *How to use From the year you want to display, all data, number of households, total sex and total, total. *Function The population (male, female, total), you can sort by the number of households. When you select all the municipalities, you can choose to show or hide prefecture names as options. *Data source Portal Site of Official Statistics of Japan website (http://www.e-stat.go.jp/).
Screenshots
Verdict
The clearest difference is ads: JHP byNSDev at none against Gengou Lib's shown. JHP byNSDev also leads on update cadence (every 7 months vs every 61 months). Gengou Lib's advantage is iOS requirement (13.0 vs 15.6). On price, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Gengou Lib ships an update every 61 months, JHP byNSDev every 7 months. The most recent releases landed on August 13, 2026 and September 16, 2026 respectively.
| Parameter | Gengou Lib | JHP byNSDev |
|---|---|---|
| Price | Free | Free |
| Rating | 2.5 (2 ratings) — better | — |
| Positive reviews | 84.5% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 61 months | Every 7 months — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 6 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | Masayuki Akamatsu | NIHON SYSTEM DEVELOPER CORPORATION |
In-app purchases
Gengou Lib
No in-app purchases
JHP byNSDev
No in-app purchases
Questions
Is Gengou Lib free?
Is JHP byNSDev free?
Do Gengou Lib or JHP byNSDev have ads?
Which is updated more often, Gengou Lib or JHP byNSDev?
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